固定电话蓝牙适配器设计

针对传统固定电话手柄与座机电话之间的连线限制了通话者的移动空间，而手机在高层或地下建筑内信号非常弱甚至没有信号的问题，为了使固定电话与移动电话的优缺点实现互补，本文设计了一种用于固定电话线路的蓝牙适配器．文中对通话电路、振铃电路、蓝牙模块等电路进行了设计，通过嵌入式开发软件实现了适配器的通信功能．使用该适配器，手机、PDA、平板电脑及计算机等具有蓝牙通话功能的设备都可以通过固定电话线路进行接打电话．

The Design of Bluetooth Adapter for Fixed-line Telephone

A handset is needed while making phone calls using traditional fixed-line phone. The wire used to connect the handset and the phone significantly restricts the moving of the phone users and thus causes many incon- veniences. On the other hand, the cellphone siginal is sometimes very poor or even zero in high-rise buildings or basements. Aiming at these problems, a Bluetooth adapter for fixed-line phone was suggested in this paper. The speaking circuit, ringing circuit and Bluetooth modle eircult were designed. The adapter function was achieved through embedded software programming. With this adapter, all Bluetooth devices （e. g. smartphone, PDA, tab- let） can be used to make phone calls through the fixed-line phone.